Accession Number : ADA300904
Title : An Approximate Buckling Analysis for Rectangular Orthotropic Plates with Centrally Located Cutouts.
Descriptive Note : Technical paper,
Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
Personal Author(s) : Nemeth, Michael P. ; Stein, Manuel ; Johnson, Eric R.
PDF Url : ADA300904
Report Date : FEB 1986
Pagination or Media Count : 22
Abstract : An approximate analysis for predicting buckling of rectangular orthotropic composite plates with centrally located cutouts is presented. In this analysis, the prebuckling and buckling problems are converted from a two-dimensional to a one-dimensional system of linear differential equations with variable coefficients. The conversion is accomplished by expressing the displacements as series with each element containing a trigonometric function of one coordinate and a coefficient that is an arbitrary function of the other coordinate. Ordinary differential equations are then obtained from a variational principle. Analytical results obtained from the approximate analysis are compared with finite element analyses for isotropic plates and for ?O sub 10s, 9O sub 10s, and (O/9O) sub 5s specially orthotropic plates with central circular cutouts of various sizes. Experimental results for the specially orthotropic plates are also presented. In nearly all cases, the approximate analysis predicts the buckling mode shapes correctly and predicts the buckling loads to within a few percent of the finite element and experimental results.
Descriptors : *SPACECRAFT, *AIRCRAFT, *PLATES, *BUCKLING, COMPRESSION, LOAD DISTRIBUTION, STRESS ANALYSIS, FINITE ELEMENT ANALYSIS, LOADS(FORCES), STIFFNESS, DISPLACEMENT, ELASTIC PROPERTIES, COMPOSITE STRUCTURES, BENDING, APPROXIMATION(MATHEMATICS), ISOTROPISM, RECTANGULAR BODIES, ELECTRICAL EQUIPMENT, LINEAR DIFFERENTIAL EQUATIONS.
Subject Categories : Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE